walkee



(No Model.)

2 sheets-sheen 1.. l. M. WALKER.

PUMP.

No. 302,065. Patented July 15, 1884.

N. Pneus wvwumugnpw. wnhingm. u4 c.

(N Model.) sheets-sheet 2.

. M. WALKER.

PUMP.

No. 302,065. Patentedqnly 15, '1884;

N4 PETERS MLRMIWMY. VIM D.C.

UNITED vSTATES APi-VIENT OFFICE.

MIcIAH WALKR, or roar nunon, MICHIGAN.

PUMP.

SPECIFICATION formingprt f Letters Palle-Ill'. N0. 302,065, dated July 15, 1884.

Application iled November 21, 1883. (No model.)

To all whom it may concern:

Be it known that I, MIcIAI WALKER, of Port Huron, in the county of St. Clair and State of Michigan, have invented new and useful Improvements in yDevices for Priming Pumps; and I hereby declare that the followoccasions, such as occur at pumping-stationsl in cases of ire. .For municipal water-works, where large quantities of water are required e to be pumped, .either under ordinary or high pressure, the latter being desired for lire-pra, tection, two or more pumps are generally l One of these placed in the pumping-station. pumps is ordinarily kept in action While the other is generally kept in reserve for extraordinary use. extra amount of'water and pressure arises, the engineer goes to work and primes the empty pump or pumps. This priming is usually done by running the pump at a high speed,4 and delay is often caused vfrom the inability of the pump to exhaust the air. readily. By this invention I desire to obviate these diiicultiesthat is, that at this particular point of time the speed of the pump which Isin action is not high enough to runl the reserve-pumps fast enough to make them catch water, and for obvious reasons this speed cannot be `safely increased beyond a certain point. In many pumping-works where two or more pumps are used and connected so as to work together, and where but very little water is required, the speed is so slow thatin case'of the least defective action ofthe valves from any reason, one or more of the pumps may lose the prim ing, or they may stop for a short time. The

4only recourse leftito the engineer is to disconvnicipal water-works.

When a sudden demand for such nect-the pump-in action fromthe others and allow it to waste its water, and thereby relieve the pressure upon it, when its speed may be sufficiently increased to meet the demand, so 'as to make the other pumps catch water, or

to detach the acting pump and run the idle pumps till they catch water and .then reconnect them. Of course all engineers will readily see the objections to this,`and I have overcome the difficulties as hereinafter described.

Figure l is a cross-section of two pumps as .usually'placed in the pumping-station of mu- Fig. 2 is a cross-section on the line X X in Fig. l. Fig. 3 is a perspective view of a 'double pump with my im- Aprovement attached thereto. 1

In the accompanying drawings, which form am part of this specification, A represents the. two pumpcylinders,"l3 the Atwo air-chambers,

C the two vacuum-chambersD the two suction-pipes, and E the two discharge'pipes, all the above-named parts and their connections being any of the known constructions' for the purposes intended. e

F vis an air-pipe connected with and affording communication between the two vacuumchambers C, such communication beingcontrolled bythe opening and closing of thevalve G, with which the pipe F is provided for that purpose. v

When but one pump is in operation the communication between the vacuum chambers may be cut ofi. A sudden demand is made, as

for instance, 'for the necessary nre-pressure, and the reserve-pump must be brought into action, when the engineer connects his pumps and opens a communication between the vacuum chambers, when the movement of the first pump will exhaust by suction the air from the suction-pipe and cylinder ofthe other, when the suction of the latter will fill the suction-pipe and pump-cylinder with water, both pumps now being in action without any of the difficulties which have been enumerated, and which are obvious to every skilled engineer. When the pumps are thus,y acting conjointly this connection herein described is left open, and hence it is impossible for any one of the pumps to lose water, no'matter what the condition of its valves may be. 1

ICO

by the operation of the former, substantially as and for the purpose specified.

3. A series of pumps provided with vacuum- 1 5 chambers, and the pipe F and valve G, arranged substantially as set forth, whereby the ai r from the inactive pumps is exhausted by the operation of thc pump in action, as and for the purpose specilied.

` MICIAH VALKER.

Witnesses:

H. S. SPRAGUE, E. SoULLY. 

